Your baby at 12 weeks
Major structures have formed and will continue growing and maturing. The skeleton begins to become firmer.
Movement continues, but it is usually still too early to feel it. A scan can provide information that symptoms cannot.
TRIMESTER 1 · WEEK 12
12 weeks pregnant
The early foundations are in place.
What to expect at 12 weeks pregnant: your baby, your symptoms and this week’s reminders.
Symptoms at 12 weeks pregnant
- Nausea may start easing for some people.
- Tiredness or breast tenderness may continue.
- Constipation may occur.
None of these symptoms is required. Symptoms alone cannot diagnose pregnancy or establish your baby’s wellbeing.
Follow the appointment and screening plan agreed with your healthcare team.
Source for this week: NHS — Week 12
YOUR WEEK, YOUR JOURNEY
Explore another pregnancy week
Choose a week to explore your baby’s development and changes you may notice.
01 · FIRST TRIMESTERSmall beginnings
02 · SECOND TRIMESTERA growing connection
03 · THIRD TRIMESTERGetting closer to meeting
Sources and content note
This is source-based general information, not a substitute for a clinical assessment or individual care plan. The presence, absence or change of symptoms alone cannot establish pregnancy wellbeing. This content is not a personalised care plan reviewed by a healthcare professional.
This guide groups weeks 1–13 in the first trimester, 14–27 in the second, and 28 onwards in the third. Weeks refer to gestational age dated from the last menstrual period; clinical dating may differ.
- NHS — Pregnancy week by week
- ACOG — Fetal development and gestational age
- NHS — Your baby’s movements
- NHS — Pregnancy symptoms
Sources checked: 31 October 2026 · Illustrations are AI-generated conceptual drawings, not ultrasound or diagnostic images.